Abstract
IN a paper1 dealing with the connexion between cytology and taxonomy, Prof. Tischler makes a statement to the effect that the four haploid chromosomes of Crepis setosa conjugate to form two pairs at the time of meiosis in the species hybrid Crepis biennis (n = 20) × C. setosa (n = 4). This he credits to us in a paper2 in which we described a constant fertile form, C. artificialis, derived from these two species. Prof. Tischler also expresses doubt as to the occurrence of such a phenomenon. He says (p. 48): “Nicht dur die 20 Chromosomen der ersten Art schlossen sich auto-syndetisch zu Paaren zusammen, sondern auch die 4 der zweiten. Wir erhalten so 12 Gemini. Und es ist doch die Zerlegung der vier Chromosomen in zweieinander ‘homologe’ Paare mehr als unwahrschein-lich.”
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References
Tischler, G. "Verknüpfungsversuche von Zytologie und Systematik bei den Blutenpflanzen." Bericht. Deutsch. Boi. Gesell., 47, 31–49; 1929.
Collins, J. L., L. Hollingshead, and P. Avery . "Interspecific hybrids in Crepis III. Constant fertile forms containing chromosomes derived from two species." Genetics, 14, 305–320; 1929.
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COLLINS, J., HOLLINGSHEAD, L. & AVERY, P. Autosyndesis among Crepis setosa Chromosomes. Nature 126, 759–760 (1930). https://doi.org/10.1038/126759b0
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DOI: https://doi.org/10.1038/126759b0
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